十六进制转十进制 2021.12.02

方法和上一题方法类似：先转换为2进制，再转为10进制

具体代码如下：

package introductory;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;

public class test03 {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String s = br.readLine();
        br.close();
        String s1 = "";
        s1 = s.toUpperCase();

        String[] HEXs = {
                "0","1","2","3","4","5","6","7",
                "8","9","A","B","C","D","E","F"
        };

        String[] BINs = {
                "0000","0001","0010","0011","0100","0101","0110","0111",
                "1000","1001","1010","1011","1100","1101","1110","1111"
        };

        //十六进制转二进制
        StringBuffer sbBins = new StringBuffer();
        for(int i=0; i=0; i--){
            if(s3.charAt(i) == '0'){
                continue;
            }else{
                value += Math.pow(2,s3.length()-1-i);
            }
        }

        System.out.println(value);

    }
}